To supply sufficient power to electrically driven equipment without increasing mounted load.

In this type of laying or transferring device adopting compressed air, a slit seal member 3 is arranged in a slit pipe 1 formed with a slit 2, while an inner mobile body 4 is movably arranged. A connection member 6 projected from the slit 2 and a pressure receiving member 7 blocking a pipe passage of the slit pipe 1 are arranged inside the inner mobile body 4. A running dolly 12 which is connected to the connection member 6 runs along the slit pipe 1. The running dolly 12 has a running roller 13 rotated wile being abutted against the slit pipe 1, a generator 50 which generates power upon reception of torque of the running roller 13, and a battery B stores power generated by the generator 50. When the running dolly 12 runs, the generator 50 starts generation for charging the battery B.